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300 psi+ Piston rifle

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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300 psi+ Piston rifle

Unread postAuthor: CpTn_lAw » Mon Apr 27, 2009 12:16 pm

Hello guys!!

I'm here to present to all of you, my newest build, a (relatively) high-pressure,barrel-sealing, piston pneumatic rifle ! Now, this is my first homemade piston rifle and i'm still running into problems, to name some there're piston lube probs, exhaust ones, as my current exhaust is a 180 psi rated blowgun, wich i'm afraid to submit to more. So in future improvements, i might put some kind of spring-loaded ball-valve exhaust.
The chamber is 1" steel, the valve is a homemade 3/4" piston one. The piston is hot glue poured into a 20 mm copper pipe with grease on the inner-wall. I also put a neoprene disc on top of it with a screw that goes all-the-way to the bottom.

The gun is pressurized using a schrader valve with the inside removed, and secured with a 1/2" steel ball-valvle.
Some speed indications (not exactly accurate but give you an idea) All of these are tested at 14 bars (200 psi)
-6mm
Airsoft BB 0.25 gram : 294 m/s
Glass BB 0.16 gram : 322 m/s
Steel BB 0.88 gram : 254 m/s
Steel bolt 0.55 gram: 270m/s

Little Specs:

Chamber : 1" steel
Valve : 3/4" piston; homemade.
Barrels : 1m x 6.02 mm ; 1m x 15mm ; 40cm x 1cm ;

And i also made a video, be sure to watch it in HQ . There will be more to come when i pass my exams! until then, have fun and be safe ;)

[youtube]http://www.youtube.com/watch?v=ckWJFIyn2EA[/youtube]
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Unread postAuthor: Carlman » Mon Apr 27, 2009 12:27 pm

Wow man thats really nice, looks like it has quite a kick too!

Love the shot of the projectile going toward the tree!

Keep up the good work!
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Unread postAuthor: VH_man » Mon Apr 27, 2009 12:36 pm

Im sure Ive asked this before, but what do you use as a high-speed camera?

I like it. Simple. Any chance on a view of the internal parts of the piston valve? I'm interested in how you did it.
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Unread postAuthor: Carlman » Mon Apr 27, 2009 12:39 pm

Most probobly a 1" brass T, 1" to 3/4" bushing, 3/4" hose nipple, 3/4" pipe nipple and then adapters to the blowgun.

Well thats how my new one is anyway.
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Unread postAuthor: CpTn_lAw » Mon Apr 27, 2009 12:52 pm

Lol, it's not that it has some kick, but you actually feel it going back a bit.
The valve is a 3/4" tee, it's all in the description. i used 3/4" => 1/2" bushings and a 1/2" hose barb, with superglue in the thread so that it doesn't move and is airtight.
My camera is a casio EX-F1 ;)
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Unread postAuthor: VH_man » Mon Apr 27, 2009 12:54 pm

howd you get the hose barb to mount in backwards though? Or am i missing something.
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Unread postAuthor: CpTn_lAw » Mon Apr 27, 2009 12:59 pm

I just screwed it in. ;)
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Unread postAuthor: VH_man » Mon Apr 27, 2009 1:27 pm

but its backwards!

Im just going to have to try it I guess...... its always boggled my mind though.
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Unread postAuthor: CpTn_lAw » Mon Apr 27, 2009 1:35 pm

The threads do not stop flat ;) You can reverse it and put it backwards. I just shot a pellet at 200 psi...my god how fast it went!! :shock: It's just amazing XD
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Unread postAuthor: Gippeto » Mon Apr 27, 2009 1:35 pm

Excellent video! :) Liked the "spinning"can shot the best. :D
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Unread postAuthor: covey12 » Mon Apr 27, 2009 1:38 pm

really cool, i like it, im guessing its a little to powerful for airsoft matches lol, at 0:43 what was your target, did you just shoot through a tree with an airsoft bb? and where do you get the glass bbs?
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Unread postAuthor: CpTn_lAw » Mon Apr 27, 2009 1:43 pm

At 0:43, the projectile is a 1gram fruit, you could flatten it between your fingers; the target is a shipping cardboard tube. the walls are 4 millimeters. I was actually surprised it did it through lol ^^
yeah, above 2 joules, AEG's tend to hurt a lot, i'm developping more than 15 joules with it at 200 psi.
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Unread postAuthor: far_cry » Mon Apr 27, 2009 2:11 pm

nice gun man
but you shouldn't edit it with any sound track WE MUST HEAR THE BANG CLEARLY
i loved the shoot at the tree SLOWMO paint ball :D :D :D :D
when you test it with higher pressures like 600 psi. the blow gun can hold this pressure don't wary

and i want to buy like you camera EX-F1 can you film a 1 min video (full HD non encoded ) and upload it rapidshare and send me the link. i wanna see the quality
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Last edited by far_cry on Mon Apr 27, 2009 2:12 pm, edited 1 time in total.
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Unread postAuthor: Moonbogg » Mon Apr 27, 2009 2:12 pm

Dude 1:25 & 1:38 were SWEET! Nice gun. Looks like fun to shoot.
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Unread postAuthor: CpTn_lAw » Mon Apr 27, 2009 2:29 pm

Loool thanks guys! i'm gonna push it to 300 psi, with a couple cushions on the blow gun....
I will do a 1min 720p footage, and send it to you, but i warn you, it's really big files...the quality is great, but the fact you don't have a wide angle is kinda f***ed up in HD...

I'm worried about the blowgun though...it's light for a blowgun and the metal doesn't seem very sturdy...well, if it won't hold the 300 psi, i'll switch back to the 380 psi rated steel ball valve :D


Edit, just shot it dry at 300 psi with the blowgun. It's kinda hard to push the trigger but it does it! way to go supersonic again!!! hahaha
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